Giúp mk vs mn ơi :((((

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Giúp mk vs mn ơi :((((
giup-mk-vs-mn-oi

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RI SƠ 5 years 2020-10-18T00:24:37+00:00 1 Answers 118 views 0

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  1. Amity
    0
    2020-10-18T00:26:35+00:00
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    Đáp án:

    1/ x = 9

    2/ x = 7

    3/ x = 3

    4/ x = 12

    5/ x = 3

    6/ x không thỏa mãn

    7/ x = 1

    8/ x = 3

    9/ x = 9

    10/ x = 9 

    Giải thích các bước giải:

    1/ 2^4 . x – 3.5x = 5^2 – 2^4

    => 16.x – 3.5x = 25 – 16

    => 16.x – 15.x = 9

    => x = 9

    2/ 3^2.x + 2^2.x = 26.2^2 – 13

    => 9.x + 4.x = 26.4 – 13

    => 13.x = 91

    => x = 91 : 13 = 7

    3/ 5^2 . x – 2^4 . x=  3^4 – 6.3^2

    => 25.x – 16.x = 3^2 . 3^2 – 6.3^2

    => 9.x = 3^2(3^2 – 6)

    => 9 .x = 9.(9 – 6)

    => 9.x = 9.3

    => x = 3

    4/ 7^2.x – 14x = 7^2.10 – 70

    => 49.x – 14.x = 49.10 – 70

    => 35.x = 490 – 70

    => 35.x = 420

    => x = 12

    5/ 6^2.x – 5^2.x = 11.2^2 – 11

    => 36.x – 25.x = 11.4 – 11

    => 11.x = 11(4 – 1)

    => 11.x = 11.3

    => x = 3

    6/ 7^2 . x + 6^2.x = 13.2^3 – 26

    => 49.x + 36.x = 13.8 – 26

    => 85.x = 78

    => x = 78/85

    Mà x là số tự nhiên => x không thỏa mãn

    7/ 2^3 . x + 5^2 . x = 2(5^2 + 2^3) – 33

    => 8.x + 25.x = 2.33 – 33

    => 33.x = 33(2 – 1)

    => 33.x = 33.1

    => x = 1

    8/ 15 : (x + 2) = (3^3 + 3) : 10

    => 15 : (x + 2) = (27 + 3) : 10

    => 15 : (x + 2) = 3

    => x + 2 = 5

    => x = 3

    9 / 20 : (x + 1) = (5^2 + 1) : 13

    => 20 : (x + 1) = (25 + 1) : 13

    => 20 : (x + 1) = 2

    => x + 1 = 10

    => x = 10 – 1 = 9

    10/ 320 : (x – 1) = (5^3 – 5^2) : 4 + 15

    => 320 : (x – 1) = (125 – 25) : 4 + 15

    => 320 : (x – 1) = 100 : 4 + 15 = 40

    => x – 1 = 320 : 40

    => x – 1 = 8

    => x = 9

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